/**
 * @author: @AngularClass
 */

const helpers = require('./helpers');
const webpackMerge = require('webpack-merge'); // used to merge webpack configs
const commonConfig = require('./webpack.common.js'); // the settings that are common to prod and dev

/**
 * Webpack Plugins
 */
const DedupePlugin = require('webpack/lib/optimize/DedupePlugin');
const DefinePlugin = require('webpack/lib/DefinePlugin');
const IgnorePlugin = require('webpack/lib/IgnorePlugin');
const LoaderOptionsPlugin = require('webpack/lib/LoaderOptionsPlugin');
const NormalModuleReplacementPlugin = require('webpack/lib/NormalModuleReplacementPlugin');
const ProvidePlugin = require('webpack/lib/ProvidePlugin');
const UglifyJsPlugin = require('webpack/lib/optimize/UglifyJsPlugin');
const WebpackMd5Hash = require('webpack-md5-hash');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

/**
 * Webpack Constants
 */
const ENV = process.env.NODE_ENV = process.env.ENV = 'production';
const HOST = process.env.HOST || 'localhost';
const PORT = process.env.PORT || 8080;
const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
  host: HOST,
  port: PORT,
  ENV: ENV,
  HMR: false
});

module.exports = function (env) {
  return webpackMerge(commonConfig({env: ENV}), {

    /**
     * Developer tool to enhance debugging
     *
     * See: http://webpack.github.io/docs/configuration.html#devtool
     * See: https://github.com/webpack/docs/wiki/build-performance#sourcemaps
     */
    devtool: 'source-map',

    /**
     * Options affecting the output of the compilation.
     *
     * See: http://webpack.github.io/docs/configuration.html#output
     */
    output: {

      /**
       * The output directory as absolute path (required).
       *
       * See: http://webpack.github.io/docs/configuration.html#output-path
       */
      path: helpers.root('dist'),

      /**
       * Specifies the name of each output file on disk.
       * IMPORTANT: You must not specify an absolute path here!
       *
       * See: http://webpack.github.io/docs/configuration.html#output-filename
       */
      filename: '[name].[chunkhash].bundle.js',

      /**
       * The filename of the SourceMaps for the JavaScript files.
       * They are inside the output.path directory.
       *
       * See: http://webpack.github.io/docs/configuration.html#output-sourcemapfilename
       */
      sourceMapFilename: '[name].[chunkhash].bundle.map',

      /**
       * The filename of non-entry chunks as relative path
       * inside the output.path directory.
       *
       * See: http://webpack.github.io/docs/configuration.html#output-chunkfilename
       */
      chunkFilename: '[id].[chunkhash].chunk.js'

    },
    module: {
      rules: [
        {
          test: /\.scss$/,
          // loaders: ["style-loader", "css-loader", "sass-loader"],
          loaders: ExtractTextPlugin.extract('css-loader?sourceMap!sass-loader')
        }
      ]
    },
  
    /**
     * Add additional plugins to the compiler.
     *
     * See: http://webpack.github.io/docs/configuration.html#plugins
     */
    plugins: [
      new ExtractTextPlugin('[name].[contenthash].css'),

      /**
       * Plugin: WebpackMd5Hash
       * Description: Plugin to replace a standard webpack chunkhash with md5.
       *
       * See: https://www.npmjs.com/package/webpack-md5-hash
       */
      new WebpackMd5Hash(),

      /**
       * Plugin: DefinePlugin
       * Description: Define free variables.
       * Useful for having development builds with debug logging or adding global constants.
       *
       * Environment helpers
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
       */
      // NOTE: when adding more properties make sure you include them in custom-typings.d.ts
      new DefinePlugin({
        'ENV': JSON.stringify(METADATA.ENV),
        'HMR': METADATA.HMR,
        'process.env': {
          'ENV': JSON.stringify(METADATA.ENV),
          'NODE_ENV': JSON.stringify(METADATA.ENV),
          'HMR': METADATA.HMR,
        }
      }),

      /**
       * Plugin: UglifyJsPlugin
       * Description: Minimize all JavaScript output of chunks.
       * Loaders are switched into minimizing mode.
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#uglifyjsplugin
       */
      // NOTE: To debug prod builds uncomment //debug lines and comment //prod lines
      new UglifyJsPlugin({
        // beautify: true, //debug
        // mangle: false, //debug
        // dead_code: false, //debug
        // unused: false, //debug
        // deadCode: false, //debug
        // compress: {
        //   screw_ie8: true,
        //   keep_fnames: true,
        //   drop_debugger: false,
        //   dead_code: false,
        //   unused: false
        // }, // debug
        // comments: true, //debug


        beautify: false, //prod
        output: {
          comments: false
        },
        mangle: {
          screw_ie8: true
        }, //prod
        compress: {
          screw_ie8: true,
          warnings: false,
          conditionals: true,
          unused: true,
          comparisons: true,
          sequences: true,
          dead_code: true,
          evaluate: true,
          if_return: true,
          join_vars: true,
          negate_iife: false // we need this for lazy v8
        }
      }),

      /**
       * Plugin: NormalModuleReplacementPlugin
       * Description: Replace resources that matches resourceRegExp with newResource
       *
       * See: http://webpack.github.io/docs/list-of-plugins.html#normalmodulereplacementplugin
       */

      new NormalModuleReplacementPlugin(
        /angular2-hmr/,
        helpers.root('config/modules/angular2-hmr-prod.js')
      ),

      /**
       * Plugin: CompressionPlugin
       * Description: Prepares compressed versions of assets to serve
       * them with Content-Encoding
       *
       * See: https://github.com/webpack/compression-webpack-plugin
       */
      //  install compression-webpack-plugin
      // new CompressionPlugin({
      //   regExp: /\.css$|\.html$|\.js$|\.map$/,
      //   threshold: 2 * 1024
      // })

      /**
       * Plugin LoaderOptionsPlugin (experimental)
       *
       * See: https://gist.github.com/sokra/27b24881210b56bbaff7
       */
      // new LoaderOptionsPlugin({
      //   debug: false,
      //   options: {

      //     /**
      //      * Static analysis linter for TypeScript advanced options configuration
      //      * Description: An extensible linter for the TypeScript language.
      //      *
      //      * See: https://github.com/wbuchwalter/tslint-loader
      //      */
      //     tslint: {
      //       emitErrors: true,
      //       failOnHint: true,
      //       resourcePath: 'src'
      //     },


      //     /**
      //      * Html loader advanced options
      //      *
      //      * See: https://github.com/webpack/html-loader#advanced-options
      //      */
      //     // TODO: Need to workaround Angular 2's html syntax => #id [bind] (event) *ngFor
      //     htmlLoader: {
      //       minimize: true,
      //       removeAttributeQuotes: false,
      //       caseSensitive: true,
      //       customAttrSurround: [
      //         [/#/, /(?:)/],
      //         [/\*/, /(?:)/],
      //         [/\[?\(?/, /(?:)/]
      //       ],
      //       customAttrAssign: [/\)?\]?=/]
      //     },

      //   }
      // }),
      new CopyWebpackPlugin([{
          from: 'config/heroku',
          to: './'
        },
        {
          from: 'CNAME',
          to: './'
        }
      ])
    ],
    /*
     * Include polyfills or mocks for various node stuff
     * Description: Node configuration
     *
     * See: https://webpack.github.io/docs/configuration.html#node
     */
    node: {
      global: true,
      crypto: 'empty',
      process: false,
      module: false,
      clearImmediate: false,
      setImmediate: false
    }

  });
}
